Home / 3,990.30-5,506.56-2,221.98

Finding the Fourth Proportional to 3,990.30, 5,506.56 and 2,221.98

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Solution

The fourth proportional to 3,990.30, 5,506.56 and 2,221.98 is: 3,066.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.30 : 5,506.56 = 2,221.98 : x
  2. Step 2: Convert to fraction form
    3,990.30/5,506.56 = 2,221.98/x
  3. Step 3: Cross multiply
    3,990.30x = 5,506.56 × 2,221.98
  4. Step 4: Simplify right side
    3,990.30x = 12,235,466.19
  5. Step 5: Solve for x
    x = 12,235,466.19/3,990.30
  6. Step 6: Final answer
    x = 3,066.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.